Pre-formed dental impression material



FIG. 1 is a perspective view of a pre-formed dental impression material showing my new design;

FIG. 2 is another perspective thereof that includes broken lines illustrating environmental structure that forms no part of the claimed design;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a right view thereof; and,

FIG. 8 is a left view thereof. 

The ornamental design for pre-formed dental impression material, as shown and described. 